Q: utility functions for supplying typed data

[ocramz]

I just noticed there aren't any combinators to use e.g. integers or doubles as AttributeValues, or sum types as options. The interface is "stringly-typed" and it forces some awkward code such as the following :

-- ** Conversion from primitive numerical types to AttributeValue
vi :: Int -> S.AttributeValue
vi = S.toValue

vis :: [Int] -> S.AttributeValue
vis = S.toValue . unwords . map show